If they told everybody "your info was hacked" while they hadn't cleaned it up yet, a bunch of folks would have logged on and changed their passwords, immediately exposing the NEW ones. You clean up first, then you engage the PR folks.

Also, Open means "there is no NDA preventing you from sharing your thoughts and screenshots", whereas Closed Beta (and the beta cycles before that, yes there were non-Cryptic people testing this game long before Closed Beta) was Closed because it was bound by NDA.

As one of the moderators of Cryptic's official IRC channel for this game, I was darn glad to see that NDA go; most of my job is banning jerks, but NDA enforcement required punishing nice people. That's not fun.